Tetramethylsuccinonitrile
![Ball-and-stick model of the tetramethylsuccinonitrile molecule](/Images/godic/202502/15/Tetramethylsuccinonitrile_3D_ball2656.png")
Tetramethylsuccinonitrile or TMSN is an organic compound with the formula (C(CH3)2CN)2. Classified as a di[nitrile]], it is a colorless and odorless solid. TMSN is the by-product from the use of some radical initiators used in polymer manufacture.
TMSN is derived from 2,2'-azobis-isobutyronitrile: